Argentina’s leading cable TV provider, Cablevisión, has fallen behind on plans to launch its new ultra-fast Internet service.

A Cablevisión official had said back in February that it planned to increase download speeds by up to 10 times in the first half of 2011.

But we’re now in the second half of the year and Cablevisión’s Internet unit, Fibertel, still doesn’t know when it will be able to offer the service.

Fibertel plans to offer the faster service by deploying the DOCSIS 3.0 modem technology already used in the U.S.

But a Fibertel official said no deployment date is available.

That raises questions about how ready Argentina will be for the planned arrival of Netflix, the video streaming company, which said it will offer its service in Argentina by the end of the year. Netflix requires fast Internet access, especially for HD content.